Relay Shield (ie 5V Quad Relay Module) is a small current signal control power equipment commonly used electronic module, enabling high-power single-chip control devices are widely used in SCM system to make smart home project; and can be directly plugged into the compatible the use of various types of motherboards, eliminating the patch cable troubles.

Module features are as follows:

1. Standard For Shield interfaces and shape

2. Can continue to stack other For expansion boards

3. 3 M3 screw positioning holes for easy installation

4. High Drive (5V or 3.3V) normally open contact closure

5. Onboard relay indicator (red)

Special Note: When using the For UNO board connected to it, because UNO USB interface is extremely high, should avoid green terminals are shorted its shell.

Relay Shield Interface: (the last picture show)

Relay: sky- 5V DC relay , model HJR-4102-L-5V, which Relay1 behalf of the 1st relay , the other and so on.

Power Interface : 5V DC power interface

Indicator: four lights are red when the relay is driven high , the corresponding indicator will light up .

Relay Terminals: Terminal high-power , high-current high voltage can be connected to the device . The 1st foot ( i.e. NOx) is a normally open pin , NCx pin is normally closed , COMx is common, i.e., when the relay is not driven , NOx and COMx open between two pins , NCx and COMx connection ; When the relay (x) control signal pin is high drive relays , NOx and COMx connection open between NCx and COMx.

Note: When using this board in extreme high-demand applications it may be necessary to improve thermal performance with a heat-sink or fan and to solder the wires directly to the board instead of using a screw terminal (in addition to the myriad other complications present in a high-current system) However, when using the board at currents up to 6A the chips will barely become noticeably warm.

The DCcduino Uno is a micro-controller board based on the ATmega328 and USB CH340 Serial Converter.These Chinese Uno R3 CH340 board differs from Italian Arduino UNO R3 boards in that it does not use the expensive FTDI USB-to-serial driver chip. Instead, it features the CH340 USB-to-serial converter chip which makes it low cost and 100% Arduino UNO R3 compatible board

Additionally, there are several extra sets of header connectors – some of which provide extra signals that are not easily accessible on the original board.

Main Changes:

Added two rows of the holes for the pins. Provides additional connections.

Description: This is the new Arduino Uno R3. In addition to all the features of the previous board, the Uno now uses an ATmega16U2 instead of the 8U2 found on the Uno (or the FTDI found on previous generations). This allows for faster transfer rates and more memory. No drivers needed for Linux or Mac (inf file for Windows is needed and included in the Arduino IDE), and the ability to have the Uno show up as a keyboard, mouse, joystick, etc.

The Uno R3 also adds SDA and SCL pins next to the AREF. In addition, there are two new pins placed near the RESET pin. One is the IOREF that allow the shields to adapt to the voltage provided from the board. The other is a not connected and is reserved for future purposes. The Uno R3 works with all existing shields but can adapt to new shields which use these additional pins.

Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements theÂ Processing/WiringÂ language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The open-source IDE can beÂ downloadedÂ for free (currently for Mac OS X, Windows, and Linux).

Note: The Arduino Uno R3 requires theÂ Arduino 1.0Â drivers folder in order to install properly on some computers. We have tested and confirmed that the R3 can be programmed in older versions of the IDE. However, the first time using the R3 on a new computer, you will need to have Arduino 1.0 installed on that machine.Â If you are interested in reading more about the changes to the IDE, check out the officialÂ Arduino 1.0 Release notes!

Not sure which Arduino or Arduino-compatible board is right for you? Check out "Â Arduino Buying GuideÂ "!

The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328. It has more or less the same functionality of the Arduino Duemilanove, but in a different package. It lacks only a DC power jack, and works with a Mini-B USB cable instead of a standard one.

In the Arduino Nano V3.0 (Economy) it use CP2102 USB to TTL chip Instead of FTDI.

This shield is more powerful and flexible. It supports both wave and mp3 format. Both SD card and U-disk are supported directly. Also there is an on-board 64Mbit flash which could store music files.There is a standard 3.5mm headset jacket on the shield. You could connect with a standard earphone. We also integrate an audio amplifier on the shield. You could

There is a standard 3.5mm headset jacket on the shield. You could connect with a standard earphone. We also integrate an audio amplifier on the shield. You could connect loudspeaker directly.

The Arduino Compatible LilyPad is a microcontroller board designed for wearables and e-textiles. It can be sewn to fabric and similarly mounted power supplies, sensors and actuators with conductive thread. The board is based on the ATmega328 with the Arduino bootloader. The main board has a minimum number of external components to keep it as small (and as simple) as possible. The latest version supports automatic reset for even easier programming. The back side of the LilyPad is completely flat. It uses a surface mount programming connector, which keep the header from poking through.

You need to wedge an Arduino into a really tiny spot? Simple - just use a SMD '328 IC. Oh... you want a reset, and voltage regulator too? Why didn't you say so!

Try this - the super-flat SparkFun Arduino Pro Mini, featuring a ATMega328 at 8MHz on 3.3V. Mind you, there's no headers and USB interface - you have to wire it up yourself, and have an offboard USB-serial cable to program it with!